Service Egress and Ingress QoS Policies
Quality of Service Guide 243
Description This command explicitly sets the forwarding class or sub-class or enqueuing priority when a packet is
marked with a dot1p-priority specified. Adding a dot1p rule on the policy forces packets that match
the dot1p-priority specified to override the forwarding class and enqueuing priority based on the
parameters included in the dot1p rule. When the forwarding class is not specified in the rule, a
matching packet preserves (or inherits) the existing forwarding class derived from earlier matches in
the classification hierarchy. When the enqueuing priority is not specified in the rule, a matching packet
preserves (or inherits) the existing enqueuing priority derived from earlier matches in the classification
hierarchy.
The dot1p-priority is derived from the most significant three bits in the IEEE 802.1q or IEEE 802.1p
header. The three dot1p bits define 8 Class-of-Service (CoS) values commonly used to map packets to
per-hop Quality-of-Service (QoS) behavior.
The no form of this command removes the explicit dot1p classification rule from the SAP ingress
policy. Removing the rule on the policy immediately removes the rule on all ingress SAPs using the
policy.
Parameters dot1p-value — This value is a required parameter that specifies the unique IEEE 802.1p value that
will match the dot1p rule. If the command is executed multiple times with the same dot1p-
value, the previous forwarding class and enqueuing priority is completely overridden by the
new parameters or defined to be inherited when a forwarding class or enqueuing priority
parameter is missing.
A maximum of eight dot1p rules are allowed on a single policy.
Values 0 to 7
fc fc-name — The value given for the fc-name parameter must be one of the predefined
forwarding classes in the system. Specifying the fc-name is optional. When a packet matches
the rule, the forwarding class is only overridden when the fc fc-name parameter is defined on
the rule. If the packet matches and the forwarding class is not explicitly defined in the rule,
the forwarding class is inherited based on previous rule matches.
Default None
priority {in | out | use-de} — All frames that are assigned to this forwarding class will be
considered in or out of profile based on this command or to use the default. In case of
congestion, the in- profile frames are preferentially queued over the out-of-profile frames
Values in — All frames are treated as in-profile.
out — All frames are treated as out of profile.
use-de — The profile of all frames is set according to the DEI bit.
dscp
Syntax dscp dscp-name [dscp-name...(upto 8 max)] fc fc-name [priority {low | high}]
no dscp dscp-name [dscp-name...(upto 8 max)]
Context config>qos>sap-ingress
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